Fix BZ #18086 (nice resets errno to 0)

[Mike Frysinger]

On 09 Aug 2015 16:28, Paul Pluzhnikov wrote:
> +      printf ("FAIL: errno = %d != EBADF\n", errno);

i often find error messages like this hard to parse.  explicit is better:
	printf ("FAIL: errno = %i, but wanted EBADF (%i)\n", errno, EBADF);

> @@ -47,5 +45,7 @@ nice (int incr)
>  	errno = EPERM;

not really related, but shouldn't this use __set_errno ?
-mike
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